These robustly built dividers weigh only 3 oz. and are heftier than standard size dividers.- Made of a coated marine alloy to resist corrosion- Gear synchronized arms allow one hand use and provide excellent point alignment while the center wheel/extension bar construction allows for fast action and precision adjustments- The Weems and Plath Ultralight features hardened stainless steel points and is fully adjustable - Replace a point with lead (supplied) and you have a navigator#39;s compass